Vellum Cloth: Metal Plasticity Tips?

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Hi!

Im trying to simulate a metal impact. I'd like it to keep the kink. I'm Using a Vellum Constraints set to Struts with Enable Plasticity but no matter what, it always goes back to its original shape after falling to the ground. Any tips?

...if I have Enable Plasticity activated on the Vellum Constraints, do I keep the same settings off on the Vellum Cloth? Also, what Plasticity setting should I try? (Threshold / Rate / Hardening)
Edited by olivierth - 2026年3月11日 12:47:12

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Houdini_Vellum_Plasticity_02.jpg (66.4 KB)

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Have you considered using MPM(Metal).

I had good success(for my purposes) in a project when MPM first came out.
Edited by BabaJ - 2026年3月11日 14:14:19

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What is MPM? Can't find a sop node that matches that.

AH! I'm in 19.5 so I don't have that. You think It would work form thick metals? My image example should be a full metal sheet, (no air inside)

...no matter, I'd like to do it with Vellum. Can anybody make an example that works? I've tryed so many settings for so many hours, it's driving me nuts!!!!
Edited by olivierth - 2026年3月11日 14:40:32
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The barrels I used were to be for 3d printing so I had to use a closed shelled model and for printing purposes I needed to have enough thickness too for the entire shell.

So these barrels you see are not single sided, there is thickness to it so I don't see why mpm could not work with any amount of specified thickness;

If I remember correctly it seemed at some stage the geo gets converted to 'volumes'.

The 'trick' at the end was to convert the end result back to polygons; If I remember right it was a combination of timeblend, rest and pointdeform nodes

But I think I saw with latest MPM version that there is some way that it can be done without having to go by what I did with the first release of MPM.
Edited by BabaJ - 2026年3月11日 14:56:11
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